The Children’s Vaccine Initiative is an international endeavor to ensure that children throughout the world are immunized. This book notes that one of the best opportunities to address the growing problem of immunization in the United States and to improve the health of children in developing countries lies in marshaling the vaccine development and production efforts in the United States and abroad. The book contains information on the nature and status of vaccine development and production efforts in the United States and abroad, and it recommends ways to enhance participation in the International Children’s Vaccine Initiative.